Charles Law Apparatus, Basic
Product Code : EL-POM-10374
Quick answer: The Charles law apparatus, basic, is used to show that the volume of a fixed mass of air grows in step with its temperature when the pressure is kept constant. Air trapped in a U-tube limb graduated 25-35 ml in 0.2 ml steps is warmed in a 1000 ml tall-form beaker with stirrer. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Part | Specification |
|---|---|
| U-tube | Glass, approx. 15 mm diameter |
| Plain limb | 220 mm long, with rubber bung and glass tubing fitted with rubber tubing and two pinch clips |
| Graduated limb | 120 mm long, graduated 25-35 ml x 0.2 ml, ending in a 37 mm bulb |
| Side limb | Approx. 185 mm long x 6 mm bore, at right angles |
| Water bath | 1000 ml tall-form beaker with stirrer |
How the Charles law experiment is done
Charles's law states that at constant pressure the volume of a fixed mass of gas is proportional to its absolute temperature, V/T = constant. In this apparatus the air sealed in the bulb and graduated limb is the gas sample, the liquid in the U-tube acts as its movable boundary, and the water in the beaker sets its temperature.
- Stand the U-tube in the 1000 ml tall-form beaker and fill the beaker with water so that the bulb and graduated limb are covered.
- Note the starting volume of trapped air on the 25-35 ml scale and the water temperature from a thermometer.
- Warm the water in steps, stirring well so the bath is even.
- At each temperature, adjust the liquid so that its levels in the two limbs are equal, keeping the trapped air at atmospheric pressure, then read the volume.
- Plot volume against temperature in degrees Celsius.
The volume rises by nearly the same amount for each degree of warming. Extending the straight-line graph back to zero volume gives a temperature near -273 deg C, which introduces absolute zero and the Kelvin scale. The fine 0.2 ml divisions on the graduated limb make these small changes easy to read.
Key features
- U-shaped glass tube of about 15 mm diameter
- Graduated limb reading 25-35 ml in 0.2 ml divisions, ending in a 37 mm bulb that holds the air sample
- Plain limb, 220 mm long, with rubber bung, glass tubing and two pinch clips
- Side limb about 185 mm long and 6 mm bore, set at right angles
- 1000 ml tall-form beaker and stirrer for an even water bath
- Simpler set-up than the combined apparatus, with no mercury reservoir
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Charles law apparatus at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Properties of Matter products
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- Boyles Law Apparatus, Advanced with Oil (EL-POM-10375)
- Expansion of Liquid Apparatus (EL-POM-10372)
- Bourdon Gauge (EL-POM-10376)
- Liquid Level Apparatus (EL-POM-10371)
- Lift Pump (EL-POM-10377)
The full range is in the Properties of Matter section of the Physics Lab range.
Frequently asked questions
What does the Charles law apparatus, basic, show?
It shows that the volume of a fixed mass of air increases with temperature when its pressure is kept constant, as stated in Charles's law.
How finely can the volume be read?
The graduated limb reads 25-35 ml in 0.2 ml divisions.
How is the air heated?
The U-tube stands in the 1000 ml tall-form beaker of water, supplied with a stirrer, and the water is warmed in steps.
What is the price of the Charles law apparatus?
Prices are not published on the website. Add the Charles law apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-POM-10374 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Charles law apparatus?
Yes. Lab Exports manufactures the Charles law apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-POM-10374.
Request a quote
Email [email protected] with the house code EL-POM-10374 and the quantity, or add the Charles law apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
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